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Photo Credit: Cecilia Parsons<br />
Continued from Page 4<br />
some heat and chill interdependence<br />
according to University of California<br />
(UC) researcher Louise Ferguson.<br />
Excess chill hours means fewer heat<br />
hours are necessary in the spring for<br />
good bloom and fruit set. Spring heat<br />
compensates slightly for winter chill<br />
deficiency. Very warm spring temperatures<br />
can adversely affect flower<br />
quality.<br />
Ambient air temperatures may not<br />
reflect what trees are experiencing,<br />
Ferguson said. Other environmental<br />
conditions such as fog or bright sunlight<br />
may influence tree response. For<br />
example, less fog or wetness decreases<br />
evaporative cooling. More sunlight<br />
hours may warm even the shaded<br />
parts of a tree. Another method for<br />
measuring chill hour accumulations,<br />
called chill portions, places weight<br />
on intermittent warm temperatures<br />
during the November 1-<strong>February</strong> 28<br />
time period. The chill portion formula<br />
subtracts from the total hours<br />
accumulated when temperatures reach<br />
55 degrees. There is no correlation<br />
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Page 6 West Coast Nut <strong>February</strong> <strong>2017</strong>
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